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Post by craigmiller on Sept 27, 2014 19:57:03 GMT -8
Hi all! I've been learning a ton on here. I'd love to get some input on my heater design. I live in an approx 1400 sq ft single story home in Northeast Texas. I'm planning to use the Peterberg Batch Box Design for an 8" system. This will be our primary heat source. It will have one or two masonry bells. Here's the rough SketchUp FileIs this basic design on target? Is an 8" system overkill? Improvements you would suggest?
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Post by peterberg on Sept 29, 2014 7:33:18 GMT -8
I live in an approx 1400 sq ft single story home in Northeast Texas. I'm planning to use the Peterberg Batch Box Design for an 8" system. This will be our primary heat source. It will have one or two masonry bells. At the innovators gathering I've built an 8" system. It turned out to be very, very powerful, might be too much for your house. What is your winter temperature and how well is the house insulated? Is this basic design on target? It's too sketchy, not clear where the firebox and riser would be placed. Try to draw a more complete set up first I would say.
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Post by craigmiller on Sept 29, 2014 18:50:28 GMT -8
I believe its standard fiberglass insulation in 2x6 stud walls (R-19). Fiberglass insulation above the ceiling is probably R-26 or so. No underfloor insulation in the crawl space. I'm going to be placing my heater fairly close to my HVAC unit in hopes of being able to push some of the warmth to the bedrooms (as well as keeping it centrally located). We get quite a bit of winter wind. Average low temps during December, January, and February are 1-5 degrees Celsius. Average highs are 14-16 C. See chart here. Since my original post I've been stewing on the design. With an 8' ceiling and a riser height of about 57 inches, there's barely enough space to go with a double bell. Here's a drawing showing very approximately, a 2' deep x 5' wide x 6' tall single bell design for the 8" system. Obviously the oven door would need to be re-positioned. Craig's Batch Heater 2Glaring design flaws?
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Post by Dan (Upstate NY, USA) on Sept 30, 2014 0:53:16 GMT -8
You could get away with a 6" system, and 8" system in your climate needs a big storage mass or your house will go from too cold to too hot like a plain old steel box wood stove.
I have an 8" system in 1500 sq ft, R40 walls and R60 ceilings in Upstate New York. Much colder than Texas, I could have gotten away with a 6" system... Right now I have a little less then 2 ton of mass...
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Post by craigmiller on Sept 30, 2014 10:24:54 GMT -8
That's helpful wolf. Where do I find pictures of your build?
I've seen discussion on ISA. Has anyone proposed the ideal mass for a 6" system?
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Post by Dan (Upstate NY, USA) on Oct 1, 2014 0:53:26 GMT -8
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Post by ericvw on Oct 1, 2014 2:47:00 GMT -8
Hey Wolf, The pics stop at a shot of some cacti... Are the bricks at the feed in the first pic standard fire bricks from say, the hardware store? They look like the dense brick I have. Bet it's gettin cold in my former home state up there? Eric
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Post by peterberg on Oct 1, 2014 3:32:35 GMT -8
With an 8' ceiling and a riser height of about 57 inches, there's barely enough space to go with a double bell. Here's a drawing showing very approximately, a 2' deep x 5' wide x 6' tall single bell design for the 8" system. Obviously the oven door would need to be re-positioned. Glaring design flaws? Craig, yes there are. As wolf1004 also suggested, an 8" batch box system would be almost certainly too large. Your drawing shows a firebox that's even larger than such a system. Please adhere to the tried and tested sizing and scaling method, this thing is quite critical as far as the dimensions go. A 6" inch batch box is about as powerful as an 8" J-tube, I'd think that would be your best bet. Elevate the firebox at least one foot from the floor, that would be easier to load. I haven't got any numbers for the mass, but the maximum internal surface area has been figured out for some time. That turned out to be just short of 6 sq. m. or 64.6 sq ft, ignoring the floor area. Coupled to a capable chimney this will be a very nice stove. By the way, the top gap above the riser need to be much larger, one foot at least and in practise there's no maximum. I've been using a headroom of 4 ft succesfully.
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Post by craigmiller on Oct 1, 2014 10:20:07 GMT -8
Thanks Peter! Yes, I plan to be very precise with your published batch box, port, and riser interior dimensions. I hope to get a 6" redesign cranked out soon. Thanks for the tip on top gap!
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Post by craigmiller on Oct 1, 2014 19:31:33 GMT -8
Okay, here's a drawing with dimensions being fairly closely calculated. The ISA is very close to spot on for a 6" system unless I overlooked something. Is the oven too close to the heat riser?
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Post by Dan (Upstate NY, USA) on Oct 2, 2014 1:05:55 GMT -8
At ericvw all 95 pics are shared publicly, and all of them have more than 500-1000 views. Try again.
And yes they are the dense brick, in the current version I get my insulation from thick layers of rockwool and perlite.
Its not cold at all up here, indian summer right now, highs in the 70Fs!
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Post by ericvw on Oct 2, 2014 3:31:30 GMT -8
Wolf! For some reason, Google + just decided to work today! Wow- great job, love that build. Hope to be posting mine soon... EVW
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